Impy sleeps downstairs in his crate, by choice, but Hero doesn't care for crates (he virtually ripped his apart in an effort to explain this to me a while back), so his nighttime residence is my bathroom. When I'm lying in bed at night, trying to go to sleep, I will often hear the sound of Hero licking his paws. He seems to spend hours cleaning his paws (the backyard is often muddy this time of year, and a dog has to keep his paws nice and white). It's a soft, but very annoying sound.
Later, when I'm just about asleep, he'll apparently get bored with the paw-cleaning thing, and will pick up his ball and start squeaking it. Sq-UUUUEAK! Sq-UUUUUEAKKKK! This is a less soft, and even more annoying sound.
On the up side, my dogs are unusually flexible about going out in the morning. If it's a school morning, they know it, and they insist (noisily) on going out by eight or so. But on a weekend morning, they've been known to let me sleep till ten or eleven. As long as I'm in bed, they'll permit me to sleep. The minute I get out of bed, though, they figure it's my duty to take care of them, so they raise a ruckus and demand to be let outside.
I guess being allowed to sleep in on weekends makes up for all the squeaking and paw cleaning:-).